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        <h1 id="记录一些题目"><a href="#记录一些题目" class="headerlink" title="记录一些题目"></a>记录一些题目</h1><h2 id="2018-8-16"><a href="#2018-8-16" class="headerlink" title="2018/8/16"></a>2018/8/16</h2><p>实现一个 <code>transform</code> 方法把一个对象的 <code>key</code> 从驼峰的形式转换成 <code>_</code> 的形式。举个例子：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> obj = &#123;</span><br><span class="line">  newUserInfo: &#123;</span><br><span class="line">    newBook: [</span><br><span class="line">      <span class="number">1</span>,</span><br><span class="line">      <span class="number">2</span>,</span><br><span class="line">      &#123;</span><br><span class="line">        userInfo: <span class="number">2</span></span><br><span class="line">      &#125;</span><br><span class="line">    ],</span><br><span class="line">    w: <span class="number">2</span></span><br><span class="line">  &#125;,</span><br><span class="line">  isURL: &#123;</span><br><span class="line">    heyTTT: <span class="string">"dhsajk"</span></span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">transform(obj)</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * &#123;</span></span><br><span class="line"><span class="comment"> *   new_user_info: &#123;</span></span><br><span class="line"><span class="comment"> *      new_book:[</span></span><br><span class="line"><span class="comment"> *        1,</span></span><br><span class="line"><span class="comment"> *        2,</span></span><br><span class="line"><span class="comment"> *        &#123;</span></span><br><span class="line"><span class="comment"> *          user_info: 2</span></span><br><span class="line"><span class="comment"> *        &#125;</span></span><br><span class="line"><span class="comment"> *      ],</span></span><br><span class="line"><span class="comment"> *      w:2</span></span><br><span class="line"><span class="comment"> *   &#125;,</span></span><br><span class="line"><span class="comment"> *   is_url: &#123;</span></span><br><span class="line"><span class="comment"> *     hey_ttt: "dhsajk"</span></span><br><span class="line"><span class="comment"> *   &#125;</span></span><br><span class="line"><span class="comment"> * &#125;</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment">*/</span></span><br></pre></td></tr></table></figure>
<p>需要注意一下，递归对象、和数组都要考虑，同时出现 <code>isURL</code> 这种连续大写的也要考虑。当时在纸上手写了大概五六分钟，还行，不太难：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> transformKey = <span class="function"><span class="params">key</span> =&gt;</span> &#123;</span><br><span class="line">  <span class="keyword">const</span> reg = <span class="regexp">/([A-Z]+)/g</span></span><br><span class="line">  <span class="keyword">return</span> key.replace(reg, (_, a) =&gt; &#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="string">`_<span class="subst">$&#123;a.toLowerCase()&#125;</span>`</span></span><br><span class="line">  &#125;)</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">const</span> isObject = <span class="function"><span class="params">obj</span> =&gt;</span> &#123;</span><br><span class="line">  <span class="keyword">return</span> <span class="built_in">Object</span>.prototype.toString.call(obj) === <span class="string">'[object Object]'</span></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">const</span> transform = <span class="function"><span class="params">obj</span> =&gt;</span> &#123;</span><br><span class="line">  <span class="keyword">return</span> <span class="built_in">Object</span>.keys(obj).reduce(<span class="function">(<span class="params">accu, current</span>) =&gt;</span> &#123;</span><br><span class="line">    <span class="keyword">let</span> value = obj[current]</span><br><span class="line">    <span class="keyword">if</span> (isObject(value)) value = transform(value)</span><br><span class="line">    <span class="keyword">if</span> (<span class="built_in">Array</span>.isArray(value)) value = transformArray(value)</span><br><span class="line">    current = transformKey(current)</span><br><span class="line">    accu[current] = value</span><br><span class="line">    <span class="keyword">return</span> accu</span><br><span class="line">  &#125;, &#123;&#125;)</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">const</span> transformArray = <span class="function"><span class="params">arr</span> =&gt;</span> &#123;</span><br><span class="line">  <span class="keyword">return</span> arr.reduce(<span class="function">(<span class="params">accu, current</span>) =&gt;</span> &#123;</span><br><span class="line">    <span class="keyword">if</span> (isObject(current)) current = transform(current)</span><br><span class="line">    <span class="keyword">if</span> (<span class="built_in">Array</span>.isArray(current)) current = transformArray(current)</span><br><span class="line">    accu.push(current)</span><br><span class="line">    <span class="keyword">return</span> accu</span><br><span class="line">  &#125;, [])</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<hr>
<p>解析 <code>url</code> 参数，出场率还挺高，和上面差不多：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> getParams = <span class="function"><span class="keyword">function</span> (<span class="params">url</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">let</span> [url, paramsString] = url.split(<span class="string">'?'</span>)</span><br><span class="line">    <span class="keyword">return</span> paramsString.split(<span class="string">'&amp;'</span>).reduce(<span class="function">(<span class="params">accu, current</span>) =&gt;</span> &#123;</span><br><span class="line">        <span class="keyword">let</span> [key, value] = current.split(<span class="string">'='</span>)</span><br><span class="line">        <span class="keyword">if</span>(accu[key]) &#123;</span><br><span class="line">            <span class="keyword">if</span>(<span class="built_in">Array</span>.isArray(accu[key])) &#123;</span><br><span class="line">                accu[key].push(value)</span><br><span class="line">            &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                <span class="keyword">let</span> temp = accu[key]</span><br><span class="line">                accu[key] = [temp, value]</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            accu[key] = value</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> accu</span><br><span class="line">    &#125;, &#123;&#125;)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<hr>
<p><img src="/2018/08/16/几个题目/1301854874.jpg" alt="Vincent van Gogh – The Drinkers"></p>
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